CVE-2023-36811: borgbackup is an opensource, deduplicating archiver with compression and authenticated encryption

Q: How do I fix CVE-2023-36811?

borg: upgrade to 1.2.5. Exact commands for each OS are on this page.

Q: Is CVE-2023-36811 being exploited?

CVE-2023-36811 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2023-36811 affect?

CVE-2023-36811 affects borg. Severity is medium (CVSS 4.7). borgbackup is an opensource, deduplicating archiver with compression and authenticated encryption. A flaw in the cryptographic authentication scheme in borgbackup allowed an attacker to fake archives and potentially indirectly cause backup

Q: How urgent is CVE-2023-36811?

Priority 17/100. No elevated risk signals yet.

Routine

MEDIUM 4.7UPGRADE

CVE-2023-36811 is a medium-severity flaw (CVSS 4.7) affecting borg. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

borgbackup is an opensource, deduplicating archiver with compression and authenticated encryption. A flaw in the cryptographic authentication scheme in borgbackup allowed an attacker to fake archives and potentially indirectly cause backup data loss in the repository. The attack requires an attacker to be able to: 1. insert files (with no additional headers) into backups and 2. gain write access to the repository. This vulnerability does not disc

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.7 (Medium)
Attack vector	Local
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.1% (top 99%)
CISA exploited list	No
Weakness	CWE-347
Published	2023-08-30
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: borgbackup

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2023-08-30 18:15 UTCPublished CVE record published
2026-06-17 06:07 UTCUpdated Record last modified

borgbackup borg UPGRADE

Affected: < 1.2.5

Fixed in: 1.2.5

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy borg || rpm -q borg || borg --version

2. UPGRADE to 1.2.5 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade borg

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade borg

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2023-36811?

borg: upgrade to 1.2.5. Exact commands for each OS are on this page.

Is CVE-2023-36811 being exploited?

CVE-2023-36811 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2023-36811 affect?

CVE-2023-36811 affects borg. Severity is medium (CVSS 4.7). borgbackup is an opensource, deduplicating archiver with compression and authenticated encryption. A flaw in the cryptographic authentication scheme in borgbackup allowed an attacker to fake archives and potentially indirectly cause backup

How urgent is CVE-2023-36811?

Priority 17/100. No elevated risk signals yet.

Related CVEs

CVE-2023-26265 MEDIUM 5.3 UPGRADE The Borg theme before 1.1.19 for Backdrop CMS does not sufficiently sanitize path arguments that are passed in

References

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